Cargando…
Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear
One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts. This paper addresses the issu...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321326/ https://www.ncbi.nlm.nih.gov/pubmed/35888391 http://dx.doi.org/10.3390/ma15144924 |
_version_ | 1784756017690574848 |
---|---|
author | Podaril, Martin Prášil, Tomáš Majernik, Jan Kampf, Rudolf Socha, Ladislav Gryc, Karel Gráf, Martin |
author_facet | Podaril, Martin Prášil, Tomáš Majernik, Jan Kampf, Rudolf Socha, Ladislav Gryc, Karel Gráf, Martin |
author_sort | Podaril, Martin |
collection | PubMed |
description | One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts. This paper addresses the issue of reducing the melt gasification by using FDU (Foundry Degassing Unit) unit. The gas content in the melt is evaluated by determining the Dichte Index depending on the geometry and the degree of the FDU unit rotor wear. For experiments performed under the operating conditions, three types of graphite rotors with different geometries are used. The extent of melt gasification and the Dichte Index are monitored during the rotor wear, at a rate of 0%, 25%, 50%, 75% and 100% rotor wear. Secondly, the chemical composition of the melt is monitored depending on the design and wear of the rotor. It is proven that the design and the degree of rotor wear do not have significant effect on the chemical composition of the melt and all evaluated samples fell within the prescribed quality in accordance with EN 1706. With regard to the overall comparison of the geometry and wear of individual rotor types, it has been proven that, in terms of efficiency, the individual rotors are mutually equivalent and meet the requirements for melt degassing throughout the service life. |
format | Online Article Text |
id | pubmed-9321326 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-93213262022-07-27 Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear Podaril, Martin Prášil, Tomáš Majernik, Jan Kampf, Rudolf Socha, Ladislav Gryc, Karel Gráf, Martin Materials (Basel) Article One of the most important indicators of casting quality is porosity. The formation of pores is largely conditioned by the presence of hydrogen in the batch and subsequently in the melt. The gasification of the melt is the primary factor increasing the porosity of casts. This paper addresses the issue of reducing the melt gasification by using FDU (Foundry Degassing Unit) unit. The gas content in the melt is evaluated by determining the Dichte Index depending on the geometry and the degree of the FDU unit rotor wear. For experiments performed under the operating conditions, three types of graphite rotors with different geometries are used. The extent of melt gasification and the Dichte Index are monitored during the rotor wear, at a rate of 0%, 25%, 50%, 75% and 100% rotor wear. Secondly, the chemical composition of the melt is monitored depending on the design and wear of the rotor. It is proven that the design and the degree of rotor wear do not have significant effect on the chemical composition of the melt and all evaluated samples fell within the prescribed quality in accordance with EN 1706. With regard to the overall comparison of the geometry and wear of individual rotor types, it has been proven that, in terms of efficiency, the individual rotors are mutually equivalent and meet the requirements for melt degassing throughout the service life. MDPI 2022-07-15 /pmc/articles/PMC9321326/ /pubmed/35888391 http://dx.doi.org/10.3390/ma15144924 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Podaril, Martin Prášil, Tomáš Majernik, Jan Kampf, Rudolf Socha, Ladislav Gryc, Karel Gráf, Martin Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear |
title | Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear |
title_full | Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear |
title_fullStr | Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear |
title_full_unstemmed | Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear |
title_short | Aluminum Melt Degassing Process Evaluation Depending on the Design and the Degree of the FDU Unit Graphite Rotor Wear |
title_sort | aluminum melt degassing process evaluation depending on the design and the degree of the fdu unit graphite rotor wear |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9321326/ https://www.ncbi.nlm.nih.gov/pubmed/35888391 http://dx.doi.org/10.3390/ma15144924 |
work_keys_str_mv | AT podarilmartin aluminummeltdegassingprocessevaluationdependingonthedesignandthedegreeofthefduunitgraphiterotorwear AT prasiltomas aluminummeltdegassingprocessevaluationdependingonthedesignandthedegreeofthefduunitgraphiterotorwear AT majernikjan aluminummeltdegassingprocessevaluationdependingonthedesignandthedegreeofthefduunitgraphiterotorwear AT kampfrudolf aluminummeltdegassingprocessevaluationdependingonthedesignandthedegreeofthefduunitgraphiterotorwear AT sochaladislav aluminummeltdegassingprocessevaluationdependingonthedesignandthedegreeofthefduunitgraphiterotorwear AT gryckarel aluminummeltdegassingprocessevaluationdependingonthedesignandthedegreeofthefduunitgraphiterotorwear AT grafmartin aluminummeltdegassingprocessevaluationdependingonthedesignandthedegreeofthefduunitgraphiterotorwear |